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Diffstat (limited to 'arch/m32r/include/asm/bitops.h')
| -rw-r--r-- | arch/m32r/include/asm/bitops.h | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/arch/m32r/include/asm/bitops.h b/arch/m32r/include/asm/bitops.h new file mode 100644 index 000000000000..aaddf0d57603 --- /dev/null +++ b/arch/m32r/include/asm/bitops.h @@ -0,0 +1,275 @@ +#ifndef _ASM_M32R_BITOPS_H +#define _ASM_M32R_BITOPS_H + +/* + * linux/include/asm-m32r/bitops.h + * + * Copyright 1992, Linus Torvalds. + * + * M32R version: + * Copyright (C) 2001, 2002 Hitoshi Yamamoto + * Copyright (C) 2004 Hirokazu Takata <takata at linux-m32r.org> + */ + +#ifndef _LINUX_BITOPS_H +#error only <linux/bitops.h> can be included directly +#endif + +#include <linux/compiler.h> +#include <asm/assembler.h> +#include <asm/system.h> +#include <asm/byteorder.h> +#include <asm/types.h> + +/* + * These have to be done with inline assembly: that way the bit-setting + * is guaranteed to be atomic. All bit operations return 0 if the bit + * was cleared before the operation and != 0 if it was not. + * + * bit 0 is the LSB of addr; bit 32 is the LSB of (addr+1). + */ + +/** + * set_bit - Atomically set a bit in memory + * @nr: the bit to set + * @addr: the address to start counting from + * + * This function is atomic and may not be reordered. See __set_bit() + * if you do not require the atomic guarantees. + * Note that @nr may be almost arbitrarily large; this function is not + * restricted to acting on a single-word quantity. + */ +static __inline__ void set_bit(int nr, volatile void * addr) +{ + __u32 mask; + volatile __u32 *a = addr; + unsigned long flags; + unsigned long tmp; + + a += (nr >> 5); + mask = (1 << (nr & 0x1F)); + + local_irq_save(flags); + __asm__ __volatile__ ( + DCACHE_CLEAR("%0", "r6", "%1") + M32R_LOCK" %0, @%1; \n\t" + "or %0, %2; \n\t" + M32R_UNLOCK" %0, @%1; \n\t" + : "=&r" (tmp) + : "r" (a), "r" (mask) + : "memory" +#ifdef CONFIG_CHIP_M32700_TS1 + , "r6" +#endif /* CONFIG_CHIP_M32700_TS1 */ + ); + local_irq_restore(flags); +} + +/** + * clear_bit - Clears a bit in memory + * @nr: Bit to clear + * @addr: Address to start counting from + * + * clear_bit() is atomic and may not be reordered. However, it does + * not contain a memory barrier, so if it is used for locking purposes, + * you should call smp_mb__before_clear_bit() and/or smp_mb__after_clear_bit() + * in order to ensure changes are visible on other processors. + */ +static __inline__ void clear_bit(int nr, volatile void * addr) +{ + __u32 mask; + volatile __u32 *a = addr; + unsigned long flags; + unsigned long tmp; + + a += (nr >> 5); + mask = (1 << (nr & 0x1F)); + + local_irq_save(flags); + + __asm__ __volatile__ ( + DCACHE_CLEAR("%0", "r6", "%1") + M32R_LOCK" %0, @%1; \n\t" + "and %0, %2; \n\t" + M32R_UNLOCK" %0, @%1; \n\t" + : "=&r" (tmp) + : "r" (a), "r" (~mask) + : "memory" +#ifdef CONFIG_CHIP_M32700_TS1 + , "r6" +#endif /* CONFIG_CHIP_M32700_TS1 */ + ); + local_irq_restore(flags); +} + +#define smp_mb__before_clear_bit() barrier() +#define smp_mb__after_clear_bit() barrier() + +/** + * change_bit - Toggle a bit in memory + * @nr: Bit to clear + * @addr: Address to start counting from + * + * change_bit() is atomic and may not be reordered. + * Note that @nr may be almost arbitrarily large; this function is not + * restricted to acting on a single-word quantity. + */ +static __inline__ void change_bit(int nr, volatile void * addr) +{ + __u32 mask; + volatile __u32 *a = addr; + unsigned long flags; + unsigned long tmp; + + a += (nr >> 5); + mask = (1 << (nr & 0x1F)); + + local_irq_save(flags); + __asm__ __volatile__ ( + DCACHE_CLEAR("%0", "r6", "%1") + M32R_LOCK" %0, @%1; \n\t" + "xor %0, %2; \n\t" + M32R_UNLOCK" %0, @%1; \n\t" + : "=&r" (tmp) + : "r" (a), "r" (mask) + : "memory" +#ifdef CONFIG_CHIP_M32700_TS1 + , "r6" +#endif /* CONFIG_CHIP_M32700_TS1 */ + ); + local_irq_restore(flags); +} + +/** + * test_and_set_bit - Set a bit and return its old value + * @nr: Bit to set + * @addr: Address to count from + * + * This operation is atomic and cannot be reordered. + * It also implies a memory barrier. + */ +static __inline__ int test_and_set_bit(int nr, volatile void * addr) +{ + __u32 mask, oldbit; + volatile __u32 *a = addr; + unsigned long flags; + unsigned long tmp; + + a += (nr >> 5); + mask = (1 << (nr & 0x1F)); + + local_irq_save(flags); + __asm__ __volatile__ ( + DCACHE_CLEAR("%0", "%1", "%2") + M32R_LOCK" %0, @%2; \n\t" + "mv %1, %0; \n\t" + "and %0, %3; \n\t" + "or %1, %3; \n\t" + M32R_UNLOCK" %1, @%2; \n\t" + : "=&r" (oldbit), "=&r" (tmp) + : "r" (a), "r" (mask) + : "memory" + ); + local_irq_restore(flags); + + return (oldbit != 0); +} + +/** + * test_and_clear_bit - Clear a bit and return its old value + * @nr: Bit to set + * @addr: Address to count from + * + * This operation is atomic and cannot be reordered. + * It also implies a memory barrier. + */ +static __inline__ int test_and_clear_bit(int nr, volatile void * addr) +{ + __u32 mask, oldbit; + volatile __u32 *a = addr; + unsigned long flags; + unsigned long tmp; + + a += (nr >> 5); + mask = (1 << (nr & 0x1F)); + + local_irq_save(flags); + + __asm__ __volatile__ ( + DCACHE_CLEAR("%0", "%1", "%3") + M32R_LOCK" %0, @%3; \n\t" + "mv %1, %0; \n\t" + "and %0, %2; \n\t" + "not %2, %2; \n\t" + "and %1, %2; \n\t" + M32R_UNLOCK" %1, @%3; \n\t" + : "=&r" (oldbit), "=&r" (tmp), "+r" (mask) + : "r" (a) + : "memory" + ); + local_irq_restore(flags); + + return (oldbit != 0); +} + +/** + * test_and_change_bit - Change a bit and return its old value + * @nr: Bit to set + * @addr: Address to count from + * + * This operation is atomic and cannot be reordered. + * It also implies a memory barrier. + */ +static __inline__ int test_and_change_bit(int nr, volatile void * addr) +{ + __u32 mask, oldbit; + volatile __u32 *a = addr; + unsigned long flags; + unsigned long tmp; + + a += (nr >> 5); + mask = (1 << (nr & 0x1F)); + + local_irq_save(flags); + __asm__ __volatile__ ( + DCACHE_CLEAR("%0", "%1", "%2") + M32R_LOCK" %0, @%2; \n\t" + "mv %1, %0; \n\t" + "and %0, %3; \n\t" + "xor %1, %3; \n\t" + M32R_UNLOCK" %1, @%2; \n\t" + : "=&r" (oldbit), "=&r" (tmp) + : "r" (a), "r" (mask) + : "memory" + ); + local_irq_restore(flags); + + return (oldbit != 0); +} + +#include <asm-generic/bitops/non-atomic.h> +#include <asm-generic/bitops/ffz.h> +#include <asm-generic/bitops/__ffs.h> +#include <asm-generic/bitops/fls.h> +#include <asm-generic/bitops/__fls.h> +#include <asm-generic/bitops/fls64.h> + +#ifdef __KERNEL__ + +#include <asm-generic/bitops/sched.h> +#include <asm-generic/bitops/find.h> +#include <asm-generic/bitops/ffs.h> +#include <asm-generic/bitops/hweight.h> +#include <asm-generic/bitops/lock.h> + +#endif /* __KERNEL__ */ + +#ifdef __KERNEL__ + +#include <asm-generic/bitops/ext2-non-atomic.h> +#include <asm-generic/bitops/ext2-atomic.h> +#include <asm-generic/bitops/minix.h> + +#endif /* __KERNEL__ */ + +#endif /* _ASM_M32R_BITOPS_H */ |